The Lach surname
In the 2010 U.S. Census, 2,515 people carried this name — #12,362 among all U.S. surnames, about 1 in every 117,600 people counted. That is up 7% from 2,345 in 2000.
In Poland’s population register
13,990 people named Lach have a registered home in Poland.
Of the 15,383 in Poland’s national register, these are the ones with a permanent address on file. They live in all 16 of Poland’s voivodeships, most of all in Lesser Poland.
Where it concentrates, on the mapWhere they live today
PESEL register, Ministry of Digital Affairs of Poland (dane.gov.pl) — CC0 · living people by voivodeship of permanent residence, 20 January 2026.
In France’s civil register
France’s register of deaths holds 218 people named Lach.
53 of them were born outside France. Those born in France came from 26 départements, most often Haut-Rhin.
Where it concentrates, on the mapWhere they were born
Fichier des personnes décédées, INSEE — Licence Ouverte 2.0 · deaths recorded in France since 1970, by place of birth.
In Argentina’s national register
At least 89 people named Lach live in Argentina.
RENAPER only publishes a name in a province when more than ten people there share it, so the real number is higher. Most of them live in Buenos Aires Province.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they live today
RENAPER (National Registry of Persons, Argentina), surnames of residents by province, December 2021 — CC BY 4.0.
In Switzerland’s population statistics
61 people named Lach live in Switzerland.
They live in 10 of Switzerland’s 26 cantons, most of all in Zurich.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they live today
Swiss Federal Statistical Office (FSO), «Surnames of the permanent resident population by canton», 2025, opendata.swiss/en/dataset/nachnamen-der-standigen-wohnbevolkerung-nach-kanton3 · names with fewer than 3 bearers in a canton are not published.
In the Nordic population registers
59 people named Lach is counted in Sweden.
Sweden’s figure is from 31 December 2022, the last count Statistics Sweden published.
Counted, by country
Own calculations based on data from Statistics Sweden (SCB), surnames with at least two bearers, 31 December 2022 — CC BY 4.0 (names with 20 or more bearers shown).
In print
Lach in American newspapers,
1906–1907.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 91,950 pages in all carry the name.
Who carried it
People named Lach,
with a public archive behind them.
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Robert Lach 1874–1958 · writer -
Andreas Lach 1817–1882 · artist
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Fritz Lach 1868–1933 · painter
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Kazimierz Lach 1886–1941 · vicar
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Franz Lach 1887–1948 · politician
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Aleksander Lach 1892–1974
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Lach.
- Lacambra 205 · U.S. census
- Lacarte 126 · U.S. census
- Lacas 133 · U.S. census
- Lacasse 3,307 · U.S. census
- Lacaze 1,123 · U.S. census
- Lacelle 286 · U.S. census
- Lachapelle 2,808 · U.S. census
- Lachat 321 · U.S. census
- Lacher 1,744 · U.S. census
- Lachmann 212 · U.S. census
- Lack 2,661 · U.S. census
- Lacombe 4,524 · U.S. census
When the index is not enough
This page says where Lach is.
A volume says what happened to it.
Every page in the index is free and stays free. The Heritage Volume is the long form: the full paper trail, the arms, the crossing — bound, and yours.